Datasheet > HM538123B

HM538123B

更新时间： 2024-11-06 04:21:51

品牌	Logo	应用领域
日立 - HITACHI		/
页数	文件大小	规格书
46页	366K
描述
1 M VRAM (128-kword x 8-bit)

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数据手册

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HM538123B 数据手册

HM538123B Series

1 M VRAM (128-kword × 8-bit)

ADE-203-231D (Z)

Rev. 4.0

Nov. 1997

Description

The HM538123B is a 1-Mbit multiport video RAM equipped with a 128-kword × 8-bit dynamic RAM and a

256-word × 8-bit SAM (serial access memory). Its RAM and SAM operate independently and

asynchronously. It can transfer data between RAM and SAM. In addition, it has two modes to realize fast

writing in RAM. Block write and flash write modes clear the data of 4-word × 8-bit and the data of one row

(256-word × 8-bit) respectively in one cycle of RAM. And the HM538123B makes split transfer cycle

possible by dividing SAM into two split buffers equipped with 128-word × 8-bit each. This cycle can

transfer data to SAM which is not active, and enables a continuous serial access.

Features

•

Multiport organization

Asynchronous and simultaneous operation of RAM and SAM capability

RAM: 128-kword × 8-bit and

SAM: 256-word × 8-bit

•

Access time

RAM: 60 ns/70 ns/80 ns/100 ns max

SAM: 20 ns/22 ns/25 ns/25 ns max

Cycle time

RAM: 125 ns/135 ns/150 ns/180 ns min

SAM: 25 ns/25 ns/30 ns/30 ns min

Low power

Active RAM: 413 mW max

SAM: 275 mW max

Standby 38.5 mW max

•

High-speed page mode capability

Mask write mode capability

Bidirectional data transfer cycle between RAM and SAM capability

Split transfer cycle capability

Block write mode capability

Flash write mode capability

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与HM538123B相关器件

型号	品牌	获取价格	描述	数据表
HM538123BJ-10	HITACHI	获取价格	1 M VRAM (128-kword x 8-bit)
HM538123BJ-6	HITACHI	获取价格	1 M VRAM (128-kword x 8-bit)
HM538123BJ-7	HITACHI	获取价格	1 M VRAM (128-kword x 8-bit)
HM538123BJ-8	HITACHI	获取价格	1 M VRAM (128-kword x 8-bit)
HM538123JP-10	ETC	获取价格	Fast Page Mode VRAM
HM538123JP-12	ETC	获取价格	Fast Page Mode VRAM
HM538123JP-15	ETC	获取价格	Fast Page Mode VRAM
HM538253	ETC	获取价格	SERIES
HM538253B	ELPIDA	获取价格	2 M VRAM (256-kword x 8-bit) Hyper Page Mode (HM538254B)
HM538253BJ-10	ELPIDA	获取价格	2 M VRAM (256-kword x 8-bit) Hyper Page Mode (HM538254B)